A sound wave in air consists of a series of peaks of increased and decreased pre

Question

A sound wave in air consists of a series of peaks of increased and decreased pressure, relative to the ambient atmospheric pressure. If you consider a point in space with maximal pressure is the average displacement of the air molecules from their position of equilibrium positions:

A. either forward or backward, depending on position
B. forward (along the direction the wave is traveling)
C. backward (opposite the direction the wave is traveling)
D. zero
E. either upward or downward, depending on position

Explanation / Answer

A. either forward or backward, depending on position

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